docker 설치 및 정보 확인.

<테스트 환경>

 - OS : Ubuntu 16.04.2

 - 인터넷 : 사용 가능

 - 최소 조건 : kernel 버전이 3.10 이상이여야 한다. ( centos7 , ubuntu 16.04 이상 )

#1. Docker 설치

 

root@host01:~#  apt-get update                                             --> 설치 전 ubuntu package 업데이트.                                                                                         --> Done 으로 종료되면 상관이 없다. Error 발생시 rebooting 후 재시도. root@host01:~# apt-get update Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB] Hit:2 http://ftp.daumkakao.com/ubuntu xenial InRelease Hit:3 http://ftp.daumkakao.com/ubuntu xenial-updates InRelease Hit:4 http://ftp.daumkakao.com/ubuntu xenial-backports InRelease Fetched 102 kB in 1s (63.6 kB/s) Reading package lists... Done Building dependency tree Reading state information... Done 47 packages can be upgraded. Run 'apt list --upgradable' to see them. root@host01:~# curl -sSL https://get.docker.com/ | sh                  --> 도커 홈페이지에서 최신 버전을 다운받아 설치하게 된다. root@host01:~# systemctl enable docker                                   --> 부팅 시 자동시작 등록 root@host01:~# systemctl start docker                                      --> docker 서비스 시작 root@host01:~# systemctl status docker ● docker.service - Docker Application Container Engine    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)    Active: active (running) since 월 2017-09-11 14:58:07 KST; 50min ago      Docs: https://docs.docker.com  Main PID: 24912 (dockerd)    CGroup: /system.slice/docker.service            ├─24912 /usr/bin/dockerd -H fd://            └─24917 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libc  9월 11 14:58:05 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:05.813799896+09:00" level=warning msg="Your kernel does not support swap memory limit"  9월 11 14:58:05 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:05.814372300+09:00" level=warning msg="Your kernel does not support cgroup rt period"  9월 11 14:58:05 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:05.814822650+09:00" level=warning msg="Your kernel does not support cgroup rt runtime"  9월 11 14:58:05 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:05.816344139+09:00" level=info msg="Loading containers: start."  9월 11 14:58:06 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:06.993918711+09:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.  9월 11 14:58:07 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:07.229739411+09:00" level=info msg="Loading containers: done."  9월 11 14:58:07 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:07.308734925+09:00" level=info msg="Docker daemon" commit=8784753 graphdriver(s)=aufs version=17  9월 11 14:58:07 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:07.309252344+09:00" level=info msg="Daemon has completed initialization"  9월 11 14:58:07 host01.cloud.com systemd[1]: Started Docker Application Container Engine.  9월 11 14:58:07 host01.cloud.com dockerd[24912]: time="2017-09-11T14:58:07.469656176+09:00" level=info msg="API listen on /var/run/docker.sock"

 #2. Docker 버전 / 정보 확인

 

root@host01:~# docker version                                                  --> 도커를 설치하면 client/server 가 동시에 설치 된다. Client:  Version:      17.07.0-ce  API version:  1.31  Go version:   go1.8.3  Git commit:   8784753  Built:        Tue Aug 29 17:42:53 2017  OS/Arch:      linux/amd64 Server:  Version:      17.07.0-ce  API version:  1.31 (minimum version 1.12)  Go version:   go1.8.3  Git commit:   8784753  Built:        Tue Aug 29 17:41:43 2017  OS/Arch:      linux/amd64  Experimental: false root@host01:~# docker info                                                        --> 도커 구성 정보를 볼 수 있다. Containers: 0  Running: 0  Paused: 0  Stopped: 0 Images: 0 Server Version: 17.07.0-ce Storage Driver: aufs  Root Dir: /var/lib/docker/aufs  Backing Filesystem: extfs  Dirs: 0  Dirperm1 Supported: true Logging Driver: json-file Cgroup Driver: cgroupfs Plugins:  Volume: local  Network: bridge host macvlan null overlay  Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog Swarm: inactive Runtimes: runc Default Runtime: runc Init Binary: docker-init containerd version: 3addd840653146c90a254301d6c3a663c7fd6429 runc version: 2d41c047c83e09a6d61d464906feb2a2f3c52aa4 init version: 949e6fa Security Options:  apparmor  seccomp   Profile: default Kernel Version: 4.4.0-81-generic Operating System: Ubuntu 16.04.2 LTS OSType: linux Architecture: x86_64 CPUs: 1 Total Memory: 3.859GiB Name: host01.cloud.com ID: E5VS:S66K:IGMQ:PH7L:UNLN:PTR7:MLVW:VING:6YIT:NAK2:TVGP:AUDV Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Experimental: false Insecure Registries:  127.0.0.0/8 Live Restore Enabled: false WARNING: No swap limit support

 

#3. Docker 설치시 네트워크가 생성된다.

 --> 많은 역할을 하게 된다.

root@host01:~# ifconfig docker0   Link encap:Ethernet  HWaddr 02:42:ca:2b:d4:43           inet addr:172.17.0.1  Bcast:0.0.0.0  Mask:255.255.0.0           UP BROADCAST MULTICAST  MTU:1500  Metric:1           RX packets:0 errors:0 dropped:0 overruns:0 frame:0           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

 

#4. Docker 설치 위치

 - 모든 데이터가 저장되는 곳. (그렇기에 docker 를 삭제해도 해당 폴더는 삭제되지 않는다.)

root@host01:~# ls -rlt /var/lib/docker/ total 40 drwx------ 2 root root 4096  9ì›” 11 14:58 containers drwx------ 4 root root 4096  9ì›” 11 14:58 plugins drwx------ 5 root root 4096  9ì›” 11 14:58 aufs drwx------ 3 root root 4096  9ì›” 11 14:58 image drwx------ 2 root root 4096  9ì›” 11 14:58 volumes drwx------ 2 root root 4096  9ì›” 11 14:58 trust drwxr-x--- 3 root root 4096  9ì›” 11 14:58 network drwx------ 2 root root 4096  9ì›” 11 14:58 tmp drwx------ 2 root root 4096  9ì›” 11 14:58 swarm drwx------ 2 root root 4096  9ì›” 11 14:58 builder

 

#5. 일반 계정이 docker 실행을 하기 위해서는 권한을 가져야 한다.

 - 권한을 갖고 있지 않으면 아래와 같은 에러가 발생한다.

guru@host01:~$ docker run ubuntu -it /bin/bash docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.31/containers/create: dial unix /var/run/docker.sock: connect: permission denied. See 'docker run --help'.

 

root@host01:~# useradd guru -m -s /bin/bash root@host01:~# ls -rlt /home/ total 8 drwxr-xr-x 17 hp   hp   4096  6ì›” 25 08:50 hp drwxr-xr-x  2 guru guru 4096  9ì›” 11 15:29 guru root@host01:~# root@host01:~# root@host01:~# root@host01:~# passwd guru root@host01:~# ls -rlt /var/run/docker.sock srw-rw---- 1 root docker 0  9ì›” 11 14:58 /var/run/docker.sock root@host01:~# id guru uid=1001(guru) gid=1001(guru) groups=1001(guru) root@host01:~# root@host01:~# root@host01:~# root@host01:~# usermod -aG docker guru root@host01:~# id guru uid=1001(guru) gid=1001(guru) groups=1001(guru),999(docker) root@host01:~#